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revision 1.1743 by mlosch, Mon Sep 24 15:07:38 2012 UTC revision 1.1830 by heimbach, Wed Feb 20 00:52:55 2013 UTC
# Line 4  $Name$ Line 4  $Name$
4      Notes on tags used in MITgcmUV      Notes on tags used in MITgcmUV
5      ==============================      ==============================
6    
7    o OpenAD support
8      Reorganize S/R call for overall time-stepping loop to facilitate
9      OpenAD revolve loop replacement
10      (new S/R main_do_loop.F)
11    o model/src:
12      - add 3-D array 3rd dimension to argument list of S/R ADAMS_BASHFORTH2/3;
13      - pkg/cheapaml: remove local S/R ADAMS2d and use instead standard S/R
14        ADAMS_BASHFORTH2.
15    o pkg/cheapaml:
16      - add new parameter (default=F, same as before) to disable full domain
17        (including land) periodicity in X & Y dir.
18      - new S/R CHEAPAML_COPY_EDGES to copy relaxation field into edges of
19        prognostics field ; merge the 2 S/R cycle_2d_tracer and timestep_2d_tracer
20        into single S/R CHEAPAML_TIMESTEP.
21    
22    checkpoint64d (2013/02/17)
23    o pkg/monitor (angular momentum):
24      - do not add Eta contribution to the total AM if using rigid-lid;
25      - correct for Adams-Bashforth in zonal-wind part (instead of in AM_eta).
26      - horizontal discretisation: compute Zonal wind contribution separately for
27        each component (instead of from cell centered averaged) and use the 4
28        grid-cell corner averaged value of Omega*(R*cos_Phi)^2 in AM_eta part.
29      - Check that AM is conserved with linear dynamics (momAdvection=F and linear
30        FreeSurf) if using vectorInvariant momentum.
31    o model/src (horizontal grid):
32      - move initialisation of all horizontal grid arrays to null value
33        from specific horizontal grid S/R to main S/R INI_GRID;
34      - add 2 new arrays to project model C-grid velocity on to zonal direction
35        (similar to AngleCosC & -AngleSinC but at U and V point location) and
36        compute them in S/R CALC_GRID_ANGLES.
37    o pkg/seaice: replace a hard coded parameter by a runtime parameter
38        SEAICE_JFNK_tolIter
39    o pkg/seaice: introduce a restricted additive Schwarz (RAS) method in
40        preconditioner for JFNK (run LSR into the overlaps as far as possible,
41        i.e OLx/y-2, but overwrite the solution in the overlaps)
42      - extend loop range in seaice_calc_viscosity
43      - add new parameters SEAICE_OLx/y (default = OLx/y-2)
44      - add flexible loop ranges to seaice_preconditioner, seaice_calc_lsr_coeffs
45      - slightly modify loops in tridiagonal solver lsr-preconditioner
46      - by default remove the extra exchange in seaice_preconditioner with a
47        replacement of an undocumented CPP flag by SEAICE_PRECOND_EXTRA_EXCHANGE
48      - modify offline_exf_seaice so that old results without RAS are reproduced
49        for output.dyn_jfnk.txt
50      in seaice_fgmres.F (unrelated to RAS)
51      - add a cpp-flag option for a re-ordered mapping (potentially more
52        efficient), but because this changes the results, turn it off by
53        default
54      - replace the save statement by local common blocks
55    o utils/matlab:
56      - fix tile-offset in rdmnc.m when output was produced using EXCH2.
57      - update cs_grid/bk_line scripts to use load_grid.m (in utils/matlab)
58        instead of local script "load_cs.m".
59    o pkg/seaice:
60      - fix a serious bug in seaice_fgmres.F, s/r seaice_scalprod, connected
61        to the scalarProductMetric and the unrolling. By chance this does not
62        change the verification experiment, because of the particular domain
63        decomposition
64    o pkg/diagnostics:
65      - change default missing_value from UNSET_RL to -999.
66    o pkg/layers: improve vectorization of layers_fluxcalc.F
67      - step 1: split loops, make TatU/V 2D arrays. This alone reduces the cpu
68        time spent in this routine by more than a factor of 3 on an NEC-SX8
69      - step 2: replace search algorithm by a bisection algorithm found in
70        Press et al. Numerical Recipes in Fortran. This algorithm can be
71        vectorized and finds the correct bin in approx. log2(Nlayers) steps.
72        For now, use this algorithm only for TARGET_NEC_SX defined.
73      - moved the search algorithm into a separate subroutine, that is kept
74        within the same file for automatic inlining.
75      - modified catching potential errors
76    o pkg/ecco:
77      - add compile switches ALLOW_SHALLOW_ALTIMETRY and ALLOW_HIGHLAT_ALTIMETRY.
78    o model/src, pkg/autodiff, pkg/ctrl, pkg/grdchk :
79      - modifications for ALLOW_GENTIM2D_CONTROL
80      -- forward_step.F, the_main_loop.F : pass options and arrays for adjoint tapes.
81      -- load_fields_driver.F : add call to CTRL_MAP_GENTIM2D( myTime, myIter, myThid )
82      -- add xx_gentim2d0/1 in ctrl_ad_check_lev1_dir.h checkpoint_lev1_directives.h etc
83      -- use ctrl_swapffields.F (new) instead of exf_SwapFFields.F in ctrl_get_gen.F
84    o model/src:
85      - account for moist thermodynamics in (dry) potential temperature equation;
86        update results of experiments: aim.5l_cs (x2), fizhi-cs (std + aqualev)
87        and cpl_aim+ocn.
88      - also switch to standard compiler (gfortran, was using ifort previously)
89        for fizhi-cs experiments reference output.
90    o pkg/ctrl:
91      - 1st step toward generic time-varying control variable (2D) via CPP option
92        ALLOW_GENTIM2D_CONTROL
93      - note new namelist ctrl_nml_genarr in data.ctrl
94    o verification/global_ocean.cs32x15:
95      - switch off OLD_THSICE_CALL_SEQUENCE (both forward and AD code) to use new
96        thsice calling sequence and update "output.icedyn.txt" output file.
97    o pkg/ptracers:
98      - from Ryan A.: code to allow to restart a tracer at regular time interval
99        specifying a reset frequency and a reset-phase (for each tracers).
100    o pkg/thsice:
101      - implement new sequence of calls for thsice+seaice:
102          previously:   ice-Dyn,ice-Advect,ice-Thermo(thsice)
103          new sequence: ice-Thermo(thsice),ice-Dyn,ice-Advect
104      - allows (with temporary CPP option "#define OLD_THSICE_CALL_SEQUENCE"
105        in CPP_OPTIONS.h) to recover old sequence;
106      - update diagnostics for Intermediate State thsice diagnostics: now filled
107        just before advection (instead of just after advection in old sequence);
108      - update output of experiment offline_exf_seaice (standard test);
109      - in global_ocean.cs32x15 exp., postpone output.icedyn.txt update
110        by setting #define OLD_THSICE_CALL_SEQUENCE in CPP_OPTIONS.h
111    o pkg/aim_v23:
112      - use tiled array for aim_CO2 and surface wind speed for export to coupler;
113      - use standard pkg/mdsio routines to read & write CO2 pickup file;
114      - in-line S/R AIM_AIM2DYN_EXCHANGES in aim_do_physics.F;
115      - Implement new sequence of calls for seaice advection (with thsice and
116        seaice diffusion): do ice advection after ice-Thermodynamic (previously
117        was done before); change aim_do_physics.F (split the bi,bj loops block);
118      - use same CPP option (OLD_THSICE_CALL_SEQUENCE) to recover old sequence;
119    o pkg/thsice:
120      - add a missing EXCH of sIceLoad in thsice_main.F (ocean set-up) for the case
121        where just seaice diffusion is used without seaice-dynamics.
122    
123    checkpoint64c (2013/01/18)
124    o pkg/seaice:
125      - add a parameter JFNKres_tFac that can replace JFNKres_t
126        (= JFNKres_tFac*JFNKresidual before JFNK solver)
127      - add a line search option to the JFNK solver
128      - move update of u/vIce and computation of initial residual into a separate
129        routine (same file); makes the code a little easier to read (?)
130      - the line search requires computation of the residual and for some reason
131        I cannot do the update of u/vIce at the beginning of the Newton loop
132        without changing the results, so we move computation of the new residual
133        also to the end of the Newton loop, even without the line search
134    o pkg/mdsio:
135      - write missing value (corresponding to undefined array value) to meta files;
136        skip this if missing value is one (UNSET_RL would be a better value for the
137        case of undefined missing value but it's current the default missing-value);
138        Also update mdsio_read_meta.F (reading timeInterval & missing-value).
139    o pkg/exf & thsice:
140      - for diagnostics purpose, fill-up and update Qsw array (+ fill the
141        diagnostics) even when SHORTWAVE_HEATING is #undef;
142    o verification/cfc_example:
143      - turn on pkg/layers with pkg/diagnostics (to test pkg/layers and to
144        illustrate how to use it).
145    o verification/offline_exf_seaice:
146      in input: add SEAICErestoreUnderIce=.TRUE., and reduce size of forcing
147        files to only one time-record.
148      in input.thermo: narrow the 2 bands of low initial ice-concentration near
149        N & S edges; switch on SEAICErestoreUnderIce=T; use pkg/diagnostics for
150        snapshot output; same mcPheePiston value as in thsice with
151        surf-current=0.2m/s.
152      in input.thsice: similar set-up as in input.thermo (channel with same seaice
153        initial conditions).
154    o verification/cfc_example:
155      - update file "data" with more standard choice (default rotationPeriod,
156        exactConserv=T, reduce ivdc_kappa to 10, remove multiDimAdvection=F,
157        set deltaTFreeSurf to deltaTtracer) and update the output.
158    o pkg/layers:
159      - fix bolus part so that it compiles with #undef GM_BOLUS_ADVEC;
160      - ensure that "layers_bolus" is switched to False when useGMRedi=False.
161    o verification/offline_exf_seaice:
162      - set all {field}period to zero for constant-in-time forcing (not tested
163        anywhere else).
164    o verification/offline_exf_seaice:
165      - dyn_lsr  : use pkg/seaice S/R (instead of pkg/thsice) to advect sea-ice;
166      - dyn_jfnk : use pkg/thsice S/R (instead of pkg/seaice) to advect sea-ice.
167    o model/src:
168      - implement Finite-Volume method for (hydrostatic) presure gradient
169        from S.-J. Lin (QJRMS 1997), for atmosphere using sigma-coordinate.
170    o pkg/seaice: implement EVP* by Lemieux et al. (2012).
171      - In order to be compatible with the default EVP code, this requires changing
172        the EVP code around a little; and because any small change immediately
173        breaks the lab_sea.hb87 verification experiment, the reference output is
174        updated two times (each time the remaining aggrement was only 2 digits):
175        - after replacing 1/dt by 1*recip_dt with a precomputed recip_dt
176        - after replacing 1/(1+0.5*dt/tau) by a/(a+1), with a=2*tau/dt
177        The adjoint test lab_sea.evp also needed to be updated.
178      - Turn on EVP* by setting SEAICE_deltaTevp as before, and setting
179        SEAICEuseEVPstar=.true.; for EVP* SEAICE_deltaTevp does not need to be
180        a factor of SEAICE_deltaTdyn, and you can set the number of EVP steps
181        explicitly with SEAICEnEVPstarSteps (thereby overriding the default of
182        INT(SEAICE_deltaTdyn/SEAICE_deltaTevp)). Controlling EVP* is deliberately
183        kept obscure, because I need to test it a little more.
184    o pkg/cheapaml:
185      - fix few incorrect type (_RL/_RS) in subroutine calls.
186    o pkg/seaice:
187      - new S/R SEAICE_MAP_RS2VEC (similar to SEAICE_MAP2VEC) to map _RS arrays
188        to _RL vector; this fixes JFNK code when compiling with "-use_r4" option.
189    o model/src:
190      - add a warning if using select_rStar=2 with nonlinFreeSurf <> 4;
191        change (in input_ad*/data) select_rStar from 2 to 1 for AD verification
192        experiments global_ocean.cs32x15 & tutorial_tracer_adjsens (+ update output)
193    o pkg/cheapaml:
194      - replace "273.1 _d 0" by celsius2K in pkg/cheapaml/cheapaml.F and
195        update output of experiment cheapAML_box.
196      - store in CHEAPAML.h coeffs ssq[0:2] for saturation specific humidity,
197        and set them only in one place (cheapaml_readparms.F).
198      - replace "273.16 _d 0" by celsius2K & replace "3.14159 _d 0" by constant "PI"
199      - remove re-setting of main-model parameter "celsius2K" (in cheapaml_readparms)
200        and re-setting of cheapAML params "lath" & "p0" (in cheapaml_init_varia).
201    o model/src/the_main_loop.F:
202      - fix revision 129 : need both ALLOW_ECCO and ALLOW_ECCO_EVOLUTION.
203    o pkg/seaice:
204      - remove legacy branch code.
205      - retire SEAICE_GROWTH_LEGACY and SEAICE_CAP_HEFF accordingly.
206    o verification/*/code*/SEAICE_OPTIONS.h:
207      - remove documentation for retired CPP flags (SEAICE_GROWTH_LEGACY,
208        SEAICE_CAP_HEFF).
209    o pkg/cheapaml:
210      - use standard routine (S/R GET_PERIODIC_INTERVAL) to decide when it is time
211        to load new forcing fields.
212      - add missing "_d 0" where it's needed; + some editing (improve indentation).
213      - remove switch to "-r8" compiler option (no longer needed) in verification
214        cheapAML_box, keep same output (small trucation error differences).
215    o verification/offline_exf_seaice:
216      - add thermodynamics only test.
217    o verification/cheapAML_box:
218      - split the domain in 8 (2x4) tiles; add MPI and multi-threaded test;
219        keep same output (same 14 digits for cg2d).
220      - switch on "-r8" compiler option (some numerical values are missing
221        the "_d 0") and update output (only 6 digits for cg2d were preserved).
222    
223    checkpoint64b (2012/12/24)
224    o pkg/cheapaml:
225      - remove un-used variables (Qnet,EmPmR) from pickup files.
226      - store tendency of advected variables into cheapaml pickup file
227        and fix the AB-2 restart.
228    o verification/offline_exf_seaice and lab_sea adjoint:
229      - switch to new code (#undef SEAICE_GROWTH_LEGACY).
230      - switch to 4 time steps in offline, consistent with lab_sea.
231      - match parameters from SEAICE_GROWTH_LEGACY branch in data.seaice.
232      - update results after change of experiment seaice.
233    o pkg/seaice:
234      - remove option SEAICE_MULTICATEGORY; has been replaced with run-time
235        parameter SEAICE_multDim. Issue a warning if SEAICE_MULTICATEGORY is
236        still defined since SEAICE_multDim needs to be set to MULTDIM value (from
237        SEAICE_SIZE.h) to recover previous #define SEAICE_MULTICATEGORY default.
238    o model/src:
239      - add run-time parameter to select CG2D solver minimum-residual solution
240        (in case of a poor convergence).
241    o pkg/seaice/seaice_lsr.F
242      - move calculation of matrix coefficients into new
243        S/R SEAICE_CALC_LSR_COEFFS; for now this routine remains in the same
244        file; the main purpose of this change is to be able to reuse the code
245        in S/R SEAICE_PRECONDITIONER
246      - modify the computation of the residual so that the mass of sea-ice
247        is not used twice; this simplifies the calculations, but since
248        the residual is never used except when LSR_mixIniGuess.ge.4---and this is
249        not tested in testreport---this does not affect the testreport results.
250    o verification/seaice_obcs:
251      - disable SEAICE_GROWTH_LEGACY; reset input files to match those of
252        verification/lab_sea/input.salt_plume; changes results/output.txt*
253    o model/src:
254      - adapt quasi-hydrostatic formulation to work with p or p* coordinate.
255    o pkg/seaice:
256      - improve description of parameters in seaice_fgmres.F and start
257        cleaning up the code
258      - change name of SCALPROD to SEAICE_SCALPROD and modify meaning of
259        second argument
260      - add a metric based on grid cell area to SEAICE_SCALPROD; update
261        results of offline_exf_seaice.dyn_jfnk
262      - compute initial residual norm in seaice_jfnk based on SEAICE_SCALPROD
263    o pkg/aim_v23:
264      - fix an other bug in dissipation heating (grid-cell area was missing).
265    o model/src + pkg/seaice:
266      - add global (multi-tile) linear solver for pair of tri-diagonal system
267        along X and Y lines, respectively for U and V component.
268        Note: 1) MPI and cube-exchange not yet coded.
269            2) probably not accurate for poorly conditioned / large size problem.
270      - add option for SEAICE_LSR to use global (multi-tile) tri-diagonal solver;
271        default: not compiled and not used.
272    o pkg/seaice:
273      - first attempt at a multi-threaded fgmres solver for the JFNK solver:
274        introduce bi/bj loops and use global_sum_tile_rl instead of
275        mpi_allreduce in seaice_fgmres.F
276      - improve diagnostics output for fgmres solver (seaice_fgmres.F)
277      - replace a few unnecessary goto statements by if-blocks  (seaice_fgmres.F)
278      - add a verification experiment for JFNK in offline_exf_seaice
279    o verification:
280      - change (for now, only fwd test) offline_exf_seaice experiment:
281        use a re-entrant channel with idealized coastline (trapezoidal shape)
282        at southern boundary to explore seaice dynamics and thermodynamics
283        with simple forcing. Main set-up has dynamics+thermo and SST relaxation;
284        secondary test (input.thsice) use thermodynamics only with SST relaxation.
285      - add seaice-dynamics only secondary test using LSR and pkg/thsice advection.
286    o pkg/exf:
287      - disable "sstExtrapol" when Nr=1
288    o verification:
289      - add new experiment "cheapAML_box" (simple 1 layer set-up from Bruno Deremble)
290        to test pkg/cheapaml.
291    o pkg/aim_v23 & pkg/shap_filt:
292      - fix dissipation heating (erroneous gravity multiplication factor).
293    o pkg/seaice:
294      - remove unused field pressPre from jfnk solver
295      - rename two subroutines in seaice_preconditioner.F
296    o eesupp/src:
297       - S/R MDSFINDUNIT avoids reserved unit numbers (scrUnit1, eeDataUnit ...)
298    o pkg/seaice/seaice_preconditioner.F: fix preconditioner once again
299       - remove wrong parts of the rhs and the lhs (were in there
300         because I did not understand the concept of this preconditioner)
301       - add an exchange between u- and v-sweep. This increases communication
302         by a factor of two but improves the convergence of jfnk. Ideally,
303         one would like the u- and v-sweep to be independent. So far within
304         undocumented ifdefs
305       - reorganize the extra computations for printing the residuals
306    o tools/genmake2:
307      - comment out the "mpif.h" include in NetCDF test programm (for MPI built)
308        since it's not necessary (and was preventing to use MNC in some cases).
309    
310    checkpoint64a (2012/11/16)
311    o pkg/autodiff:
312      - improve pkg-internal logical parameter switch (inAd/inFwd mode) so that
313        autodiff_readparms.F no longer depends on calling order (within
314        packages_readparms.F) and no longer requires to include ${PKG}_PARMS.h):
315        rename param turnFreeDriftInAdMode to SEAICEuseFREEDRIFTswitchInAd
316        and change param SEAICEuseDYNAMICSinAdMode to SEAICEuseDYNAMICSswitchInAd.
317    o pkg/obcs:
318      - adding tidal velocity forcing capability to obcs
319        for usage example, see verification/seaice_obcs/input.tides
320    o pkg/seaice:
321      - turn the LSR-relaxation parameters WFAU/V into runtime parameters
322        SEAICE_LSRrelaxU/V
323      - introduce runtime parameter SEAICEetaZmethod (=0 by default)
324    o pkg/aim_v23:
325      - implement heating from friction (bottom friction and stratospheric drag).
326    o pkg/shap_filt:
327      - fix diagnostic "SHAP_dKE" (was 2 time smaller); implement heating from
328        dissipation but only for Shap_funct=2, active when addFrictionHeating=T.
329    o model/src:
330      - move AddMass common block from DYNVARS.h to FFIELDS.h; allow to read-in
331        time-constant addMass field from file (addMassFile);
332      - support for heating due to friction (and Kinetic Energy dissipation):
333        add option, run-time switch and 3-D field array + support code ; each pkg
334        or S/R can add heating contribution (if there is a sink of KE); the sum is
335        accounted for as a Temperature tendency term (EXTERNAL_FORCING_T).
336    o pkg/seaice:
337      - complete merge of ITD code into seaice_growth.F
338        from MITgcm_contrib/torge/itd/code/
339        no verification so far, but Torge Martin tested
340        "1-D test case and Beaufort set up;
341        deliver okay results after 1 model year."
342      - complete merge of SEAICE_SIZE.h into all relevant routines
343      - move computation of eta at Z-points into calc_viscosities
344        + introduce global field etaZ
345        + add different methods for computing etaZ, for now the old
346          method (simple averages of eta to Z-points) is hardwired
347        + replace etaMeanZ by etaZ in seaice_lsr, seaice_calc_residual,
348          seaice_preconditioner
349      - simplify computations for SEAICE_ZETA_SMOOTHREG
350      - seaice_preconditioner:
351        + replace one remaining press by pressLoc (mistake)
352        + adjust printing of residuals
353      - improve I/O of diagnostics of JFNK in seaice_jfnk.F:
354        + add (SEAICE.h) and rename some counters (initiliased in
355          seaice_init_fixed.F)
356        + add _BEGIN/END_MASTER (myThid)  around print statements
357        + print total number of iterations and failures over SEAICE_monFreq
358          interval to STDOUT
359      - move control over output-messages by fgmres to seaice_jfnk to save
360        some operations
361      - move resetting initial guess for fgmres outside of seaice_fgmres_driver
362        in order to make restarts with sol .ne. zero (fgmres with restarts)
363        (seaice_jfnk.F, seaice_fgmres.F)
364      - seaice_calc_l/rhs.F: replace maskW/S by maskInW/S; this fixes
365        a serious convergence problem when open boundaries are involved
366    o pkg/ggl90: fix computation of control volumes for the case of
367      ALLOW_GGL90_HORIZDIFF (probably not used very often): move control volumes
368      up half a grid cell from C-centered to W-centered (pointed out by C. Eden)
369    o pkg/seaice: simplify seaice_evp by avoiding use of extra fields u/vIceC
370    o pkg/autodiff
371      - Add inAdMode switch for SEAICEuseDYNAMICS:
372        SEAICEuseDYNAMICSinAdMode
373        (extend logic in ADAUTODIFF_INADMODE_SET)
374    o pkg/seaice
375      - Step 1 of merging ice-thickness distribution (ITD) code from
376        MITgcm_contrib/torge/itd/ (author: Torge Martin)
377        The code implements concept laid out in Thorndike et al. (1975);
378        code is enabled via CPP flag SEAICE_ITD
379        nITD (in SEAICE_SIZE.h) defines number of ice thickness categories;
380        code is not complete yet!!
381      - SEAICE_SIZE.h now included in almost all seaice routines
382    o verification (using seaice):
383      - switch back seaice-dynamics (+ lower SOLV_MAX_ITERS) in ADM exp.
384        global_ocean.cs32x15.seaice ; update results.
385      - compile B-grid dynamics in FW test exp 1D_ocean_ice_column ;
386      - compile C-grid dynamics with #define SEAICE_ALLOW_JFNK in FW test exp
387        offline_exf_seaice (previously compiling B-grid).
388    o pkg/exf:
389      - fix some STOP conditions in exf_check.F (from Aug 28, modifs did not allow
390        to specify neither just 1 comp of wind or wind-stress, nor no surface momentum
391        forcing): just replace CPP option ALLOW_ATM_WIND with run-time param useAtmWind.
392    o pkg/layers (adjust changes from Sept 19):
393      - do snap-shot output and fill diagnostics from inside iLa loop (layers_calc.F)
394        this allows to remove "layers_maxNum" dimension from all layers arrays.
395    o pkg/layers (adjust changes from Sept 19):
396      - remove ALLOW_LAYERS_OUTPUT ; fix snap-shot and time-ave output ;
397      - snap-shot extended to all type of layers (not just the 1rst type);
398      - remove layers variables when corresponding CPP option is undef.
399    o pkg/layers:
400      - rename pkg/layers variable and add new output (layer exist & un-weighted
401        velocity in layer)
402    o pkg/seaice:
403      - simplify (?) ocean-drag coefficent computations by using
404        the same routine in all three solvers (saves some code lines)
405      - remove global fields DRAGA and DRAGS from C-grid code and
406        declare them locally in lsr.F (the only place where they are
407        still used)
408      - update AD output of lab_sea.evp (very sensitive anyway).
409    o pkg/seaice: add Jacobian-free Newton Krylov solver for ice dynamics
410      (Lemieux et al. 2010, 2012). Turn on with the usual SEAICE_ALLOW_JFNK
411      and SEAICEuseJFNK=.true. A few things to note:
412      - involves a FGMRES, that is parallel but very inefficient,
413        because of many scalar products (global sums) in the Gram-Schmidt
414        orthogonalization method. Needs to be replaced. Original code
415        from J.-F. Lemieux
416      - preconditioner for FGMRES is a stripped down version of LSOR
417      - SOLV_MAX_ITERS is now used for LSOR as a solver and as a
418        preconditioner. For the preconditioner, the default is set to 10.
419      - Jacobian times vector is computed with finite differences
420      - marginally related to JFNK-solver: add a smooth regularization for
421        zeta with tanh that will improve convergence (Lemieux and Tremblay,
422        2009) for any implicit solver (not implemented for EVP because EVP
423        does not need this regularization in the first place). Define
424        SEAICE_ZETA_SMOOTHREG in SEAICE_OPTIONS.h to use.
425    o eesupp/src:
426      - check in genmake2 that intrinsic S/R flush is available.
427      - add S/R to flush IO unit (if intrinsic S/R flush is available)
428      - flush standard & error msg unit before MPI termination
429      - if debugMode, flush IO unit after printing msg
430    o pkg/ctrl:
431      - ctrl_unpack.F, ALLOW_GENARR3D_CONTROL code: fix missing argument in call
432        to ctrl_set_unpack_xyz.
433    
434    checkpoint64 (2012/10/09)
435    o pkg/shelfice
436      - in mom_fluxform.F, mom_vecinv.F:
437        CALL SHELFICE_V_DRAG(bi,bj,k,vFld,KE,KappaRU,vF,myThid)
438        Bug fix KappaRU -> KappaRV
439        does not change verification/isomip but may change other setups
440        (presumably constant KappaRU=KappaRV)
441      - fix diagnostics SHIU/Vdrag (thanks to Tom Millgate)
442    o pkg/obcs:
443      - fixed some indexing bugs in obcs_seaice_sponge.F
444      - added obcs relaxation subroutines for HSALT and HSNOW
445      - changes verification/seaice_obcs/results/obcs_seaice_sponge.F
446  o pkg/seaice:  o pkg/seaice:
447    - add "multicategory" parameterization for snow in analogy to ice,    - add "multicategory" parameterization for snow in analogy to ice,
448      default is off for now.      default is off for now.

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